Electrochemical Explanation for Asymmetric Electrowetting Response
asymmetry, contact angle, electrowetting, passivation, Young Lippman
Digital Object Identifier (DOI)
In electrowetting, a droplet/substrate contact angle is modulated by applying a potential difference between the droplet and the substrate. Typically, the droplet potential is changed via an auxiliary electrode dipped in the droplet. Here, it is shown that electrochemical reactions lead to a potential drop on the auxiliary electrode in electrowetting, which degrades the droplet contact angle modulation. The magnitude of this effect depends on the voltage polarity. This problem can be addressed by using a dielectric layer, such as SiO2, which can prevent electrochemical reactions with the electrowetting substrate and the auxiliary electrode.
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Citation / Publisher Attribution
Thin Solid Films, v. 548, p. 632-635
Scholar Commons Citation
Khodayari, Mehdi; Crane, Nathan B.; and Volinsky, Alex A., "Electrochemical Explanation for Asymmetric Electrowetting Response" (2013). Mechanical Engineering Faculty Publications. 13.